LOS ANGELES: Police on Thursday identified the man they say carried out a murder-suicide that took the life of an engineering professor at UCLA.

The shooter was Mainak Sarkar, said Officer Jenny Houser, a city police spokeswoman. Sarkar is listed on a UCLA website as a member of a computational biomechanics research group run by the victim, a professor of biomechanical engineering.

The shooting Wednesday brought a massive police response and widespread fear of an active shooter among tens of thousands of people at the university. Now fear has shifted to sadness as many lament the death of a professor who worked on computer models of the human heart who was also a doting father who coached his young son’s baseball team.

Bill Klug, a professor of mechanical engineering, was gunned down in an engineering building office Wednesday, according to a law enforcement official with knowledge of the investigation but not authorized to publicly discuss it.

Finding the gunman’s motive in killing Klug will be foremost in the investigation as it continues Thursday.